EP3346794B1 - Accès multiple avec écoute de porteuse pour cellulaire dans une bande sans licence - Google Patents

Accès multiple avec écoute de porteuse pour cellulaire dans une bande sans licence Download PDF

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Publication number
EP3346794B1
EP3346794B1 EP18157786.7A EP18157786A EP3346794B1 EP 3346794 B1 EP3346794 B1 EP 3346794B1 EP 18157786 A EP18157786 A EP 18157786A EP 3346794 B1 EP3346794 B1 EP 3346794B1
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Prior art keywords
channel
predetermined time
idle
listen
contention window
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German (de)
English (en)
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EP3346794A1 (fr
EP3346794C0 (fr
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Abhijeet Bhorkar
Christian Ibars Casas
Pingping Zong
Apostolos Papathanassiou
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Intel Corp
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Intel Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

Definitions

  • Embodiments pertain to cellular wireless technologies. Some embodiments relate to cellular wireless technologies operating in unlicensed communication bands.
  • a licensed frequency spectrum is a range of frequencies that are exclusively assigned to a particular entity (e.g., a particular wireless carrier) for use. As the available licensed frequency spectrums are limited and as demand rises for cellular wireless services, the amount of free assigned spectrum available for use is limited.
  • US 2014/0036853 A1 relates to a method for transmitting signals over an unlicensed band of a base station in a wireless communication system. Scheduling for an unlicensed band in case that a carrier sensing is performed first to transmit PDSCH on the unlicensed band and the unlicensed band is available as a result of the carrier sensing.
  • An eNode B performs a carrier sensing from a previous time of a subframe n to transmit PDSCH in the subframe n on an unlicensed band.
  • the carrier sensing can be performed with a specific interval and the specific interval may correspond to an OFDM symbol space of a subframe.
  • Ratasuk et al "License-exempt LTE deployment in heterogeneous network", 2012 International Symposium on Wireless Communication Systems (ISWCS), August 2012 , investigates deploying LTE on a license-exempt band as part of the pico-cell underlay. Coexistence mechanism and other modifications to LTE are discussed. Performance analysis shows that LTE can deliver significant capacity even while sharing the spectrum with WiFi systems.
  • LTE Long Term Evolution
  • cellular wireless devices e.g., a base station or a mobile device such as a smart phone
  • a "channel" is a band of (usually but not always contiguous) frequencies used for wireless communications.
  • a design assumption of these cellular protocols is that they have exclusive access to the frequencies on which they operate. They are generally only concerned with coordinating amongst other devices participating in the same network.
  • a base station an eNodeB
  • UE User Equipment
  • the eNodeB generally does not consider other users in other networks when planning transmission and reception of data. If a cellular wireless network began transmitting in the unlicensed channel without modification, the cellular wireless devices would transmit and receive continuously. This would prevent other devices from utilizing the channel.
  • devices operating in unlicensed channels consider not only devices operating in a single network (e.g. controlled by a single operator), but devices operating in many different networks and devices operating using other protocols.
  • devices operating according to wireless protocols such as an 802.11 standard defined by the Institute for Electrical and Electronics Engineers (IEEE) (Wi-Fi) consider not only devices in their own network (i.e., a Basic Service Set - BSS), but devices in other BSSs and indeed devices running other protocols before determining whether they can use the wireless medium.
  • IEEE Institute for Electrical and Electronics Engineers
  • a method for adapting a cellular wireless protocol to operate in an unlicensed channel in a manner that allows the cellular wireless protocol to share the unlicensed channel with other devices Disclosed in some examples are systems, machine-readable media, methods, and cellular wireless devices which implement a Listen-Before-Talk (LBT) access scheme for a device operating according to a cellular wireless protocol in an unlicensed band.
  • LBT Listen-Before-Talk
  • a cellular wireless device may utilize the cellular wireless protocols in the unlicensed channels after the LBT access scheme has determined that the channel (a defined range of frequencies in a particular spectrum) in the unlicensed spectrum is idle for a particular period of time.
  • a “cellular wireless device,” as used herein, is any device that is operating according to a cellular wireless protocol.
  • a “cellular wireless protocol” is a wireless protocol defining a cellular wireless network which is distributed over land areas called cells, each cell served by at least one fixed-location transceiver, known as a cell site or base station. These cell sites are interconnected to provide wireless services over a wide geographic area.
  • Example cellular wireless protocols that may be adapted for transmission in the unlicensed channels include cellular wireless protocols according to one of an LTE family of standards promulgated by the Third Generation Partnership Project (3GPP), a Universal Mobile Telecommunications System (UMTS) family of standards promulgated by 3GPP, a Global System for Mobile Communications (GSM) family of standards, and the like.
  • a cellular wireless device may be a base station such as a NodeB or an eNodeB, or may be a mobile device such as a User Equipment (UE).
  • UE User Equipment
  • a cellular wireless device may use the licensed band for controlling transmissions and other parameters used on the unlicensed band. This may include obtaining CSI feedback, scheduling decisions on PDCCH, and the like.
  • Example transmissions of the cellular wireless devices in the unlicensed channel include transmissions to support one or more of Layer 1, Layer 2, Layer 3, and other layers of these cellular protocols, for example, the Physical (PHY) layer, the Media Access Control (MAC) layer, the Radio Link Control (RLC) layer, the Packet Data Convergence Protocol (PDCP), and the Radio Resource Control (RRC) layers.
  • Channels transmitted in the unlicensed frequency may include any uplink data channels, uplink control channels, downlink data channels, and downlink control channels. Examples include one or more of a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), a Physical Downlink Control Channel (PDCCH), and a Physical Uplink Control Channel (PUCCH).
  • PDSCH Physical Downlink Shared Channel
  • PUSCH Physical Uplink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • PUCCH Physical Uplink Control Channel
  • a cellular wireless device such as a cellular base station (e.g., eNodeB) may provide a cell with uplink and downlink capabilities in the licensed spectrum and also provide a supplemental downlink (SDL) channel in an unlicensed spectrum.
  • the SDL channel may carry one or more LTE channels, such as a PDSCH.
  • the LBT techniques may be applied to the SDL channel to ensure that the unlicensed channels are idle and free of interference.
  • the LTE may be the cellular wireless device which implements the LBT mechanisms.
  • the SDL may be scheduled on a PDCCH on the primary (licensed) frequencies.
  • the UE may be scheduled on the PDCCH of a licensed frequency for receiving data on the SDL PDSCH on the unlicensed frequency (i.e., using cross carrier scheduling).
  • the PDCCH that schedules the unlicensed channel may be sent on the unlicensed channel.
  • aspects of the cellular wireless protocols may be modified in one or more ways such as disclosed herein in order to operate within the unlicensed frequency spectrum.
  • an LBT access scheme is implemented in the cellular wireless protocol by the cellular wireless device.
  • the cellular wireless device implementing an LBT access mode for the unlicensed band may listen to the channel for a channel listen time (a predetermined period of time). If the channel is idle for the channel listen time, the cellular wireless device may deem that the channel is available for transmission.
  • the cellular wireless device may determine that the channel is idle by comparing the average detected power on the channel over the channel listen time to a predetermined power level threshold. If the average detected power is below the power level threshold, then the channel may be deemed available for transmission; otherwise, if the average detected power is above the power level threshold, then the channel may be deemed busy.
  • the cellular wireless device may deem the channel busy. Otherwise, if at no point during the channel listen time does the detected channel power exceed the power level threshold, then the cellular wireless device may deem the channel available.
  • the cellular wireless device may transmit immediately.
  • the cellular wireless device in response to determining that the wireless medium is available, may reserve the medium using a medium reservation technique and wait for a sub-frame boundary of the cellular wireless protocol prior to transmitting.
  • FIG. 1A a timeline 1000 of a cellular wireless device operating asynchronously in an unlicensed channel using an LBT mechanism is shown.
  • the device measures the power level of the channel for the channel listen time 1010.
  • the channel listen time 1010 is W ⁇ s.
  • the device determines that the medium is idle by conducting carrier sensing (CS) for the channel listen time 1010 and measuring the average power received over that period. If the average power received during the period is below a power level threshold (e.g., -62 dBm), then the cellular wireless device may deem the medium to be idle and available for transmission. In some examples, this method of detecting that the medium is idle differs from that of Wi-Fi carrier sensing.
  • CS carrier sensing
  • a Wi-Fi device uses both an energy detection mechanism and a signal detection mechanism. If the Wi-Fi device detects a Wi-Fi signal using the signal detection mechanism, the Wi-Fi device assumes that the channel is occupied. In some examples, the LBT method disclosed herein uses only the energy detection mechanism and not the Wi-Fi signal detection mechanisms.
  • the cellular wireless device may optionally transmit a reservation message (RSRV) 1020.
  • This reservation message may be any transmission which is designed to trigger the channel sense mechanism of one or more protocols operating on the channel of the unlicensed channel to view the channel as busy.
  • One example reservation message 1020 may be a simple transmission above a certain power level which is designed to trigger other wireless devices to detect this energy on the channel and to determine, based upon this energy, that the channel is not idle.
  • this message may be specific to a wireless protocol operating in the unlicensed band.
  • a Wi-Fi message may be transmitted by the cellular wireless device on the unlicensed channel.
  • the reservation message may reserve the channel for the transmissions of the cellular wireless device.
  • this message may be a Wi-Fi Request-To-Send (RTS) or Clear-To-Send (CTS) message.
  • RTS Wi-Fi Request-To-Send
  • CTS Clear-To-Send
  • These messages may be sent by modifying the cellular wireless protocol circuitry to transmit these messages of other protocols, or may be sent by adding protocol circuitry to send messages for other protocols (e.g., adding a Wi-Fi chip to an eNodeB).
  • the RTS or CTS messages may have a duration field which may specify the duration that the cellular wireless device needs the unlicensed channel.
  • the RTS/CTS messages may be transmitted to one or more cellular wireless devices.
  • the RTS/CTS message may be broadcast to the intended UEs.
  • the intended UEs may detect if the channel is idle.
  • the RTS/CTS may be transmitted in time or frequency multiplexed manner.
  • the cellular wireless device may then transmit 1030 using the cellular protocol.
  • the cellular wireless device may send one or more uplink or downlink cellular wireless channels carrying control or user data.
  • the cellular wireless device may transmit one or more wireless sub-frames.
  • FIG. 1B shows one example method 1100 of employing an asynchronous LBT mechanism for a cellular wireless device according to some examples of the present disclosure.
  • the cellular wireless device senses the channel for a channel listen time (e.g., W ⁇ s).
  • the cellular wireless device determines if the channel is idle. In some examples the cellular wireless device determines if the channel is idle by determining that an average received power for the channel listen time is below a power level threshold. If the channel is not deemed to be idle, the device may go back and repeat operations 1110 and 1120 until the channel is deemed idle.
  • the cellular wireless device may transmit data for the duration of the transmission opportunity (TXOP). In some examples, prior to transmitting data at operation 1130 the cellular wireless device may send a reservation message. In some examples W may be 34 ⁇ s.
  • FIG. 2A a timeline 2000 of a cellular wireless device operating synchronously in an unlicensed channel using an LBT mechanism is shown.
  • the device senses that the medium is idle for a channel listen time 2010.
  • the channel listen time 2010 is W ⁇ s.
  • the device determines that the medium is idle by conducting carrier sensing (CS) for the channel listen time and measuring the average power received. If the average power received during this period is below a power level threshold, then the cellular wireless device may deem the medium to be idle.
  • CS carrier sensing
  • the cellular wireless device may transmit a reservation message (RSRV) 2020.
  • the reservation message 2020 may be a message from another wireless protocol, such as a Wi-Fi message, and may be transmitted by the cellular wireless device. This message may reserve the wireless medium for the transmissions of the cellular wireless device. In some examples, this message may be a CTS or RTS message. These messages may be sent by modifying the cellular wireless protocol circuitry to transmit messages of other protocols, or may be sent by adding protocol circuitry to send messages for other protocols (e.g., adding a Wi-Fi chip to an eNodeB).
  • the reservation message 2020 reserves the wireless medium for the cellular wireless device for the desired transmission opportunity (TXOP) 2040 as well as the amount of time to send the data at the synchronized time (e.g., enough time to wait for a sub-frame boundary).
  • TXOP transmission opportunity
  • the reservation message 2020 may be the sum of the TXOP (transmission 2040) plus the idle period 2030 that is the period of time that elapses before the start of the next sub-frame of the cellular wireless protocol.
  • FIG. 2B shows an example method 2100 of employing a synchronous LBT mechanism for a cellular wireless device according to some examples of the present disclosure.
  • the cellular wireless device senses the channel for a channel listen time (e.g., W ⁇ s).
  • the cellular wireless device determines if the channel is idle. In some examples the cellular wireless device determines that the channel is idle by determining that an average received power for the channel listen time is below a power level threshold. If the channel is not deemed to be idle, the device may go back and repeat operations 2110 and 2120 until the channel is deemed idle. Once the channel is deemed idle, at operation 2130 the cellular wireless device aligns to the sub-frame and transmits data for the duration of the transmission opportunity. In some examples, prior to transmitting data at operation 2130 the cellular wireless device may send a reservation message.
  • a channel listen time e.g., W ⁇ s
  • the LBT technique includes a backoff procedure to avoid collisions in the presence of a large number of transmitters.
  • FIG. 3 shows one example method of an LBT technique including a backoff procedure in accordance with the claimed embodiment of the invention.
  • the cellular wireless device senses the channel for the channel listen time. If the average received power is not below the power level threshold at operation 3020, the cellular wireless device may continue to sense the channel at operation 3010. If the received power is below the power level threshold at operation 3020, and if the cellular wireless device determines not to implement the backoff at operation 3030, the cellular wireless device may transmit data for the duration of the transmission opportunity at operation 3040. As noted with respect to FIGs. 1 &2, the cellular wireless device may send a reservation message, and in some examples may align to a sub-frame boundary.
  • the cellular wireless device calculates a random backoff contention window (CW) between an absolute minimum (MIN) value and a current maximum value (CWT) at operation 3050.
  • the CWT may be initially set at the MIN level.
  • the cellular wireless device decrements the contention window CW.
  • the cellular wireless device decrements CW at operation 3060 and the cellular wireless device repeats operations 3070, 3080, and 3090 until the CW is zero (at which time the cellular wireless device transmits on the unlicensed channel at operation 3040) or until the received power is not below the threshold at operation 3090. If the received power is not below the threshold at operation 3090, then at operation 3095 the cellular wireless device goes back to operation 3010.
  • the threshold power level at operation 3090 may be the same as or different than the threshold power level at operation 3020.
  • the thresholds may be -62dbm. The backoff process may be deemed successful once the CW is zero.
  • the cellular wireless device may determine if a collision occurred during the transmission. In some examples, to do this, the cellular wireless device may calculate a transport block error (TBE) rate at operation 3100. At operation 3110 the TBE may be compared to a predetermined error threshold. In some examples the predetermined error threshold may be 0.5. If the TBE is below the predetermined error threshold, the cellular wireless device may infer that the transmission was successful and was not interfered with. In this case, at operation 3120, the current maximum value CWT may be set to the MIN value, which may be used the next time the CW is determined. At this point, the flow ends until the next time the cellular wireless device has data to send and starts the process over at operation 3010.
  • TBE transport block error
  • the cellular wireless device may set the current maximum CWT to be double the previous CWT up to a global maximum value MAX at operation 3130.
  • a new backoff CW is selected at operation 3050 and the backoff process is repeated as the cellular wireless device will attempt to retransmit the blocks that had errors.
  • the LBT mechanism disclosed herein utilizes a transport block error measurement.
  • TBE is defined specifically by the cellular wireless protocol, but in general is a measure of how successful a data transmission is over the air at the Physical/MAC layer level. For LTE, if a transport block is successfully decoded then the transmission is successful. Successful decoding is when the Cyclic Redundancy Check (CRC) calculated by the receiver matches the CRC sent in the transport block.
  • CRC Cyclic Redundancy Check
  • the TBE is a percentage or ratio of successful blocks. Wi-Fi, in contrast, assumes that a failure to receive an acknowledgement of a packet indicates a collision.
  • the cellular wireless device may send a reservation message in order to prevent other wireless devices from accessing the medium. Also, at operation 3040 the cellular wireless device may wait for a cellular sub-frame boundary before transmitting.
  • the cellular wireless device 4000 may be any device that is capable of communicating using a licensed cellular protocol.
  • the cellular wireless device 4000 is an eNodeB.
  • the cellular wireless device 4000 could also be a UE, a Base Transceiver Station (BTS), a Wi-Fi access point, a cell phone, a smart phone, a desktop computer, a laptop computer, a medical device (e.g., a heart rate monitor, a blood pressure monitor, or the like), a wearable device (e.g., computing glasses, a smart watch), or the like.
  • BTS Base Transceiver Station
  • the cellular wireless device 4000 may contain a first wireless transceiver 4030, a second wireless transceiver 4040, and control circuitry 4020 for controlling the first and second wireless transceivers.
  • the first wireless transceiver 4030 may operate on an unlicensed channel and in some examples, implement a wireless protocol that is not a cellular wireless protocol.
  • the first wireless transceiver 4030 may implement a wireless protocol that operates in the unlicensed channels, such as an IEEE 802.11 wireless protocol, a Bluetooth wireless protocol, a Bluetooth Low Energy (BLE) wireless protocol, a Zigbee wireless protocol, or the like.
  • the first wireless transceiver 4030 may determine whether the unlicensed channel is occupied with other traffic.
  • the first transceiver 4030 may detect the power level on the unlicensed channel and if the average power level is below a particular threshold for a predetermined period of time, then the control circuitry 4020 may determine that the channel is unoccupied. If the average power level is above the particular threshold for the predetermined period of time, then the control circuitry 4020 may determine that the channel is occupied. If the channel is occupied, control circuitry 4020 may instruct the first transceiver 4030 to continue to sense the channel until the received average power level is below the predetermined threshold for the predetermined period of time.
  • control circuitry 4020 can control the backoff process once the channel is deemed unoccupied.
  • the control circuitry 4020 in cooperation with the first transceiver 4030, causes the operations of FIG. 3 to be implemented, such as selecting a random contention window, decrementing the contention window, using the first transceiver 4030 to sense the channel for X ⁇ s, determining if the backoff period is over, or, if activity is detected on the channel during the backoff period, signaling the first transceiver 4030 to once again determine if the medium is free by detecting the power level on the unlicensed channel for a channel listen period of time. Once the control circuitry and first transceiver have determined that the channel is once again free, the control circuitry 4020 will start over and once again implement the backoff procedure
  • the second wireless transceiver 4040 may implement a cellular wireless protocol and may generally transmit over a licensed frequency.
  • Example cellular wireless protocols may include a Long Term Evolution (LTE family of standards promulgated by the Third Generation Partnership Project (3GPP), Universal Mobile Telecommunications (UMTS) promulgated by 3GPP, an Institute for Electrical and Electronics Engineers (IEEE) 802.16 standard known as Worldwide Interoperability for Microwave Access (WiMAX), and the like.
  • the second transceiver 4040 may provide for one or more protocol layers of the cellular wireless protocol to enable communications. For example, if the cellular wireless device 4000 is an eNodeB, the second transceiver 4040 provides the functionality to implement the eNodeB.
  • the second transceiver 4040 provides the functionality to connect to the cellular network and transfer data across that network.
  • the second transceiver 4040 may utilize the licensed bandwidth, but may also have circuitry to send and receive data across the unlicensed bandwidth.
  • Control circuitry 4020 may control the first transceiver 4030, as well as second transceiver 4040. When the control circuitry 4020 determines that the unlicensed channels should be used for the cellular wireless protocol, the control circuitry 4020 may determine when the channel is free using first transceiver 4030, and in some examples, to reserve the channel using a channel reservation message via first transceiver 4030. Once the channel is free, the control circuitry 4020 may instruct either the first or second transceivers 4030 and 4040 to transmit on the unlicensed band.
  • the cellular wireless device 4000 may send a reservation message on the unlicensed channels.
  • the reservation message has a duration field which may be set to the duration of cellular data transfer (e.g., a sub-frame).
  • the cellular wireless device 4000 may not begin transmitting until a sub-frame boundary. In these examples, if a reservation message is sent, the reservation message may have a duration equal to the duration of cellular data transfer plus the amount of time until the next sub-frame boundary.
  • the control circuitry 4020 may determine if the transmission was successful. In some examples, the transmission may be deemed successful if a TBE measurement is below a predetermined threshold. If the TBE measurement is below the predetermined threshold, the contention window for the next transmission may be set to the minimum contention window value (MIN) by setting the maximum value used in the random selection (e.g., at operation 3050 in FIG. 3 ) to the minimum value (MIN).
  • MIN minimum contention window value
  • next contention window may be doubled and the backoff process may be started for retransmitting the data.
  • FIG. 5 illustrates a block diagram of an example machine 5000 upon which any one or more of the techniques (e.g., methodologies) discussed herein may be performed.
  • the machine 5000 may operate as a standalone device or may be connected (e.g., networked) to other machines. In a networked deployment, the machine 5000 may operate in the capacity of a server machine, a client machine, or both in server-client network environments. In an example, the machine 5000 may act as a peer machine in peer-to-peer (P2P) (or other distributed) network environment.
  • the machine 5000 may be a cellular wireless device, a wireless device, or the like.
  • Example cellular wireless devices include an eNodeB, a UE, a personal computer (PC), a tablet PC, a set-top box (STB), a personal digital assistant (PDA), a mobile telephone, a web appliance, a network router, switch, or bridge, or any machine capable of executing instructions (sequential or otherwise) that specify actions to be taken by that machine.
  • PC personal computer
  • PDA personal digital assistant
  • STB set-top box
  • mobile telephone a web appliance
  • network router switch, or bridge
  • machine shall also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein, such as cloud computing, software as a service (SaaS), or other computer cluster configurations.
  • SaaS software as a service
  • Examples, as described herein, may include, or may operate on, logic or a number of components, modules, circuitry, or mechanisms.
  • Modules and circuitry are tangible entities (e.g., hardware) capable of performing specified operations and may be configured or arranged in a certain manner.
  • circuits may be arranged (e.g., internally or with respect to external entities such as other circuits) in a specified manner as circuitry.
  • the whole or part of one or more computer systems e.g., a standalone, client, or server computer system
  • one or more hardware processors may be configured by firmware or software (e.g., instructions, an application portion, or an application) as circuitry that operates to perform specified operations.
  • circuitry is understood to encompass a tangible entity, be that an entity that is physically constructed, specifically configured (e.g., hardwired), or temporarily (e.g., transitorily) configured (e.g., programmed) to operate in a specified manner or to perform part or all of any operation described herein.
  • circuitry is temporarily configured, each of the circuits need not be instantiated at any one moment in time.
  • the circuits comprise a general-purpose hardware processor configured using software
  • the general-purpose hardware processor may be configured as respective different circuitry at different times.
  • Software may accordingly configure a hardware processor, for example, to constitute a particular circuit at one instance of time and to constitute a different circuit at a different instance of time.
  • the machine (e.g., computer system) 5000 may include a hardware processor 5002 (e.g., a central processing unit (CPU), a graphics processing unit (GPU), a hardware processor core, or any combination thereof), a main memory 5001, and a static memory 5006, some or all of which may communicate with each other via an interlink (e.g., bus) 5008.
  • the machine 5000 may further include a display unit 5010, an alphanumeric input device 5012 (e.g., a keyboard), and a user interface (UI) navigation device 5014 (e.g., a mouse).
  • the display unit 5010, alphanumeric input device 5012, and UI navigation device 5014 may be a touch screen display.
  • the machine 5000 may additionally include a storage device (e.g., drive unit) 5016, a signal generation device 5018 (e.g., a speaker), a network interface device 5020, and one or more sensors 5021, such as a global positioning system (GPS) sensor, compass, accelerometer, or other sensor.
  • the machine 5000 may include an output controller 5028, such as a serial (e.g., universal serial bus (USB)), parallel, or other wired or wireless (e.g., infrared (IR), near field communication (NFC), etc.) connection to communicate with or control one or more peripheral devices (e.g., a printer, card reader, etc.).
  • a serial e.g., universal serial bus (USB)
  • USB universal serial bus
  • IR infrared
  • NFC near field communication
  • the storage device 5016 may include a machine readable medium 5022 on which is stored one or more sets of data structures or instructions 5024 (e.g., software) embodying or utilized by any one or more of the techniques or functions described herein.
  • the instructions 5024 may also reside, completely or at least partially, within the main memory 5001, within the static memory 5006, or within the hardware processor 5002 during execution thereof by the machine 5000.
  • one or any combination of the hardware processor 5002, the main memory 5001, the static memory 5006, or the storage device 5016 may constitute machine readable media.
  • machine readable medium 5022 is illustrated as a single medium, the term “machine readable medium” may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) configured to store the one or more instructions 5024.
  • machine readable medium may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) configured to store the one or more instructions 5024.
  • machine readable medium may include any medium that is capable of storing, encoding, or carrying instructions for execution by the machine 5000 and that cause the machine 5000 to perform any one or more of the techniques of the present disclosure, or that is capable of storing, encoding, or carrying data structures used by or associated with such instructions.
  • a machine readable medium may include a non-transitory machine readable medium.
  • a machine-readable medium is not a transitory propagating signal.
  • Nonlimiting machine readable medium examples may include solid-state memories, and optical and magnetic media.
  • machine readable media may include non-volatile memory, such as semiconductor memory devices (e.g., Electrically Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM)) and flash memory devices; magnetic disks, such as internal hard disks and removable disks; magneto-optical disks; Random Access Memory (RAM); and CD-ROM and DVD-ROM disks.
  • semiconductor memory devices e.g., Electrically Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM)
  • EPROM Electrically Programmable Read-Only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • flash memory devices e.g., electrically Erasable Programmable Read-Only Memory (EEPROM)
  • EPROM Electrically Programmable Read-Only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • the instructions 5024 may further be transmitted or received over a communications network 5026 using a transmission medium via the network interface device 5020 utilizing any one of a number of transfer protocols (e.g., frame relay, internet protocol (IP), transmission control protocol (TCP), user datagram protocol (UDP), hypertext transfer protocol (HTTP), etc.).
  • transfer protocols e.g., frame relay, internet protocol (IP), transmission control protocol (TCP), user datagram protocol (UDP), hypertext transfer protocol (HTTP), etc.
  • Example communication networks may include a local area network (LAN), a wide area network (WAN), a packet data network (e.g., the Internet), mobile telephone networks (e.g., cellular networks), Plain Old Telephone (POTS) networks, and wireless data networks (e.g., IEEE 802.11 family of standards known as Wi-Fi ® , IEEE 802.16 family of standards known as WiMax ® ), IEEE 802.15.4 family of standards, and peer-to-peer (P2P) networks, among others.
  • the network interface device 5020 may include one or more physical jacks (e.g., Ethernet, coaxial, or phone jacks) or one or more antennas to connect to the communications network 5026.
  • the network interface device 5020 may include a plurality of antennas to wirelessly communicate using at least one of single-input multiple-output (SIMO), multiple-input multiple-output (MIMO), or multiple-input single-output (MISO) techniques.
  • SIMO single-input multiple-output
  • MIMO multiple-input multiple-output
  • MISO multiple-input single-output
  • transmission medium shall be taken to include any intangible medium that is capable of storing, encoding, or carrying instructions for execution by the machine 5000, and includes digital or analog communications signals or other intangible media to facilitate communication of such software.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (15)

  1. Appareil pour noeud B évolué, eNodeB (4000), l'eNodeB (4000) étant configuré pour fonctionner dans un spectre sans licence et appliquer un mécanisme d'écoute de porteuse (Listen-Before Talk, LBT), avant de réaliser une transmission, l'appareil étant configuré pour :
    commander la détection (3010) d'un canal inactif pendant une période prédéterminée d'écoute d'un temps d'écoute de canal, le canal se trouvant dans le spectre sans licence ;
    caractérisé en ce que
    l'appareil est configuré en outre pour réaliser les opérations suivantes, s'il est détecté que le canal dans le spectre sans licence est inactif pendant ladite période prédéterminée du temps d'écoute de canal :
    régler (3050) une valeur de fenêtre de contention à un nombre aléatoire compris entre une valeur minimale et une valeur maximale ;
    commander la détection (3080) du canal pendant une ou plusieurs périodes supplémentaires prédéterminées du temps d'écoute de canal lorsque la valeur de la fenêtre de contention est supérieure à zéro ; et
    décrémenter (3060) la valeur, jusqu'à ce que la valeur de fenêtre de contention atteigne zéro, pour chaque période supplémentaire prédéterminée pendant laquelle il est détecté que le canal est inactif ; et
    commander la transmission (3040) de données d'un canal physique partagé de liaison descendante, PDSCH, sur le canal après qu'il est détecté que le canal est inactif pendant les périodes prédéterminées du temps d'écoute de canal et après que la valeur de fenêtre de contention est nulle.
  2. Appareil selon la revendication 1, l'appareil étant configuré en outre pour :
    commander la détection (3080) du canal soit jusqu'à ce qu'un canal occupé soit détecté dans l'une des une ou plusieurs périodes supplémentaires ou soit jusqu'à ce qu'il soit détecté que toutes les périodes supplémentaires du temps d'écoute de canal sont inactives.
  3. Appareil selon la revendication 2, l'appareil étant configuré en outre pour réaliser les actions suivantes après détection d'un canal occupé dans l'une des une ou plusieurs périodes de temps supplémentaires :
    commander la détection (3010) du canal inactif pendant un deuxième temps d'écoute de canal ; et
    s'il est détecté que le canal est inactif pendant le deuxième temps d'écoute de canal :
    régler (3050) la valeur de fenêtre de contention à un nombre aléatoire compris entre la valeur minimale et la valeur maximale ; et
    configurer les circuits d'émetteur-récepteur pour répéter la détection (3080) du canal pendant une ou plusieurs périodes prédéterminées supplémentaires du deuxième temps d'écoute de canal lorsque la valeur de la fenêtre de contention est supérieure à zéro.
  4. Appareil selon la revendication 1, l'appareil étant configuré en outre pour déterminer que le canal est inactif dans une période prédéterminée donnée du temps d'écoute de canal, si une puissance moyenne détectée est inférieure à un seuil de niveau de puissance pendant la période prédéterminée donnée (3020).
  5. Appareil selon la revendication 4 dans lequel le seuil de niveau de puissance est de -62 dBm.
  6. Appareil selon la revendication 1, dans lequel la fenêtre de contention est initialement réglée à la valeur minimale.
  7. Appareil selon la revendication 1, dans lequel chaque période prédéterminés période est de 9 ps.
  8. Appareil selon la revendication 1, dans lequel la valeur minimale est 3 et la valeur maximale est 1023.
  9. Appareil selon la revendication 1, l'appareil étant configuré en outre pour commander la transmission d'un message de réservation à envoyer sur le canal en réponse à une détermination que le canal est inactif.
  10. Support lisible par ordinateur, sur lequel sont stockées des instructions, qui, à leur exécution par des circuits de traitement d'un noeud B évolué, eNodeB (4000), destiné à fonctionner dans un spectre sans licence et à appliquer le mécanisme d'écoute de porteuse (Listen-Before Talk, LBT), avant de réaliser une transmission, amènent les circuits de traitement à réaliser les opérations suivantes :
    commander la détection (3010) d'un canal inactif pendant une période prédéterminée d'un temps d'écoute de canal, le canal se trouvant dans le spectre sans licence;
    caractérisé par
    s'il est détecté que le canal est inactif pendant la période prédéterminée du temps d'écoute de canal :
    régler (3050) une valeur de fenêtre de contention à un nombre aléatoire compris entre une valeur minimale et une valeur maximale ;
    commander la détection (3080) du canal pendant une ou plusieurs périodes prédéterminées supplémentaires lorsque la valeur de fenêtre de contention est supérieure à zéro ; et
    décrémenter (3060) la valeur de fenêtre de contention jusqu'à ce que la valeur de fenêtre de contention atteigne zéro, pour chaque période supplémentaire prédéterminée du temps d'écoute de canal dans laquelle il est détecté que le canal est inactif ; et
    commander la transmission (3040) de données d'un canal physique partagé de liaison descendante, PDSCH, sur le canal après qu'il est détecté que le canal est inactif pendant les périodes prédéterminées du temps d'écoute de canal et après que la valeur est nulle.
  11. Support lisible par ordinateur selon la revendication 10, dans lequel les opérations comportent en outre :
    la continuation de la détection (3080) du canal jusqu'à ce qu'un canal occupé soit détecté dans l'une des une ou plusieurs périodes supplémentaires prédéterminées ou jusqu'à ce qu'il soit détecté que toutes les périodes supplémentaires prédéterminées du temps d'écoute de canal supplémentaire sont inactives.
  12. Support lisible par ordinateur selon la revendication 10, dans lequel il est détecté que le canal est inactif pendant la pluralité de périodes prédéterminées du temps d'écoute du canal si une puissance moyenne détectée pendant les périodes prédéterminées est inférieure à un seuil de niveau de puissance.
  13. Support lisible par ordinateur selon la revendication 12, dans lequel le seuil de niveau de puissance est de -62 dBm.
  14. Support lisible par ordinateur selon la revendication 12, dans lequel la fenêtre de contention est initialement réglée à la valeur minimale.
  15. Support lisible par ordinateur selon la revendication 12, dans lequel chaque période de temps prédéterminée est 9 µs et dans lequel la valeur minimale est 3 et la valeur maximale est 1023.
EP18157786.7A 2014-06-30 2015-06-19 Accès multiple avec écoute de porteuse pour cellulaire dans une bande sans licence Active EP3346794B1 (fr)

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US201462019316P 2014-06-30 2014-06-30
US14/669,736 US9392614B2 (en) 2014-06-30 2015-03-26 Listen before talk for cellular in unlicensed band
PCT/US2015/036674 WO2016003674A1 (fr) 2014-06-30 2015-06-19 Accès multiple avec écoute de porteuse pour cellulaire dans une bande sans licence
EP15815429.4A EP3162157A4 (fr) 2014-06-30 2015-06-19 Accès multiple avec écoute de porteuse pour cellulaire dans une bande sans licence

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EP3162157A4 (fr) 2018-02-21
CN108076530B (zh) 2021-09-17
EP4250856A2 (fr) 2023-09-27
WO2016003674A1 (fr) 2016-01-07
JP6408035B2 (ja) 2018-10-17
CN106465425A (zh) 2017-02-22
US20170339699A1 (en) 2017-11-23
EP3162157A1 (fr) 2017-05-03
US9730220B2 (en) 2017-08-08
EP3346794A1 (fr) 2018-07-11
US20150382374A1 (en) 2015-12-31
EP4250856A3 (fr) 2023-12-20
KR101969687B1 (ko) 2019-04-16
US10568097B2 (en) 2020-02-18
KR20160148674A (ko) 2016-12-26
HK1254364A1 (zh) 2019-07-19
EP3346794C0 (fr) 2023-11-29
CN106465425B (zh) 2020-07-31
CN108076530A (zh) 2018-05-25
JP2018078651A (ja) 2018-05-17
US9392614B2 (en) 2016-07-12
KR20180005286A (ko) 2018-01-15
JP6513838B2 (ja) 2019-05-15
US20160295588A1 (en) 2016-10-06

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